Hot and cold pipes reversed for shower- how best to fix

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9 Jun 2010
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Hi all,

I'm renovating a shower room at the moment- it was hardly used hence why this plumbing error (not my work) probably slipped my mind or I didn't notice....

I've just redone the pipework for my shower valve (which I have already purchased, well outside return window and no option to reverse inlets), at 15mm centres. This was run using the existing pipework which comes down from the floor above, cutting the pipe just above where the old shower valve was. Having flushed the pipework to get rid of debris/excess flush I have noticed that the pipe on the right in fact delivers the hot water, and vice versa.

Swapping it over by accessing the void above doesn't really seem doable, without being potentially griefy. I can't remember what direction these pipes go once they go through the horizontal stud work at ceiling level, and the room above has been renovated, inc. flooring. I've also just reboarded this ceiling of this shower room, fitted extractor fan and spotlight etc.

Thus, I believe I am left with trying to resolve this within the partition wall. Do I drill a hole through the vertical stud to swap them over using some form of offset driver (I won't be able to angle the drill straight as between studs is too narrow). The only other way I can think of doing it is running the pipework all the way to the floor, and swapping them around under the floorboards in the void.

Would drilling a hole through a vertical stud like this be compliant with regs? This shower niche area wasn't part of the original floor plan as far as I am aware and was originally just a downstairs toilet. Thus, the partition has been created by taking a chunk out of the adjacent room.

Really annoying but I guess at least I realised now before I boarded and tiled...

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I did think of that but don’t want to go for that option. I’d rather get the pipework right.
 
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